ENGINE SYSTEMS
60
5) Connecting rod
Inspection
(1) Check for torsion, parallelism and damage.
Measure the torsion and parallelism using a
connecting rod aligner and correct or replace if the
repair value is exceeded.
1. Gauge
2. Piston pin
3. Torsion
4. Flat part of aligner
5. Pin
(2) Measure the bore of the connecting rod small end
bush and replace if the clearance to the piston pin
exceeds the service limit.
(3) Install the connecting rod to the crankshaft, measure
the axial play and replace the connecting rod if the
service limit is exceeded.
Torsion and parallelism of connecting rod (mm)
Standard
assembling value
Repair value
Torsion (per 100 mm)
Less than 0.08 More than 0.2
Parallelism (per 100 mm)
Less than 0.05 More than 0.15
25
Clearance between bush and piston pin (mm)
Standard assembling value Service limit
0.008 – 0.023 More than 0.08
Axial play of connecting rod and crank pin (mm)
Standard assembling value Service limit
0.1 – 0.3 More than 0.7
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